I've got no interesting story. I made it up a very long time ago. What's amusing to me is that in the intervening period of time, it's been used for other things I'm not at all involved with. I think the disambiguation of a name I came up with over 15 years ago is fairly amusing...
Frax - Mighty Morphin' Power Rangers Villain
Frax - Abbreviation for Fragile X Syndrome
Frax - Some kind of store overseas. (May be defunct?)
FRAX - A tool to evaulate bone fracture risk by the World Health Organization
Frax - A java application to generate Mandelbrot fractals